Articles tagged with: conservation

The conservation team turn detective! Part 2

on Thursday, 29 October 2015. Posted in Conservation

Curing the salt contamination in a pair of Imari vases. A serial conservation mystery, episode 2

In May we discovered that the Imari vases which had been brought to the lab from Wilton House were suffering from a case of salt contamination http://wshc.eu/blog/item/the-conservation-team-turn-detective.html. The salt had caused large cracks up the side of the vases reducing their structural stability and causing loss of some fragments and areas of glaze.

Developing a treatment

Removing salt from an object is best completed by dissolving the salts into water and removing the contaminated water from the vase taking the salt with it. If not all the contaminated water is removed during the treatment some salt will remain and the process of crystallisation will begin again, causing further deterioration.

To try out our treatment options we needed to create some test patients with similar symptoms to the Imari vases.

Undertaking clinical trials

The test patients were contaminated with salts from the base up to simulate the issue with the Imari vases.

Due to the size, weight and fragile nature of the vases treating only the affected area would be the ideal solution. We tested using a poultice made from blotting paper, cartridge paper and distilled water.

To use a poultice you apply a thin layer to the affected area and allow to dry. As the water evaporates from the surface of the poultice the salty water in the centre of the pot is drawn out and the salts are deposited in the poultice. The dried poultice can then be removed taking the salt with it.

The clinical trial turned out to prove the treatment was not effective, instead of evaporating from the poultice some of the water was drawn into the test pot and evaporated from the exposed rim leaving the salts behind.

It was clear that a plan B would have to be developed....

Malmesbury Fire Pump

on Saturday, 08 August 2015. Posted in Museums

Last year we posted a blog about work we did to conserve Malmesbury’s historic fire pump for display. The pump is one of the largest items the museum owns and arranging a space suitable for it to be displayed in was not straight forward for the museum. For this reason the fire pump had to go back into storage whilst a display area was arranged for it. But recently I have been able to go back and help with putting the item on display.

The pump belongs to the Athelstan museum in Malmesbury but is too large to fit in their own store so it has been kept in a commercial storage facility in an old aircraft hangar. I met the curator at the storage site along with two members of the modern fire brigade who had volunteered to help move the object. It was interesting to hear their opinion on this piece of historic fire fighting equipment. In particular I learnt that that although I had been calling it a fire engine it should in fact be called a fire appliance or pump. Apparently the modern fire service does not use the term fire engine at all. In the case of the appliance I had worked on it should not be called an engine as it does not have any sort of engine or motor. Its pump was powered by people pushing its handles up and down.

The Conservation Team Turn Detective!

on Friday, 22 May 2015. Posted in Conservation

Finding the cause of deterioration in a pair of Imari vases. A serial conservation mystery, episode 1

In the conservation lab we have two very large and impressive-looking vases. The vases from Wilton House, Salisbury have come to the conservation lab to be repaired as they are both structurally unstable. The conservation team turned detective in order to discover what was causing the instability. In the first episode of our conservation blog, you’ll find out how the conservators uncovered the symptoms and solved the case.

The patients

The vases are late 17th Century examples of the popular Japanese style ‘Imari’ identified from the distinctive decoration of cobalt blue under-glaze and gold and red over-glaze. This style of Japanese porcelain was produced as export for the Western market, indicated by the style sharing its name with the Japanese port from which it was transported: Imari, Saga.

The symptoms

The vases have large cracks running from the base, nearly ¾ of the way up the sides. The cracks weaken the structure and cause the significant instability. Along the edges of the cracks and round the base of the vases are missing areas of decoration and glazing. As the vases are no longer in one piece, they are not safe to display in this condition. While the cracks remain, these vases continue to be at risk of breaking apart.

 

The suspects

Although the symptoms of deterioration could be clearly identified, their cause remained a complete mystery. The conservation team could treat the symptoms. We could fill the large cracks and repair the glazing but without discovering the cause of the damage and finding a suspect, we would be taking a big risk. Further deterioration could occur in the future and the vases become irrevocably damaged.

Celebrating the 8OOth anniversary of the Magna Carta

on Monday, 16 March 2015. Posted in Conservation

The Wiltshire and Swindon History Centre have been preparing an up-coming display to mark the 800th anniversary of the Magna Carta, which is to be held at Lacock Abbey.

The display will feature three original documents: a facsimile of the 1225 Magna Carta presented to Lacock abbey after the original charter was presented to the nation; and two enrolled copies of a 1300 confirmation of the charter in the archives of the marquis of Ailesbury of Savernake and Marlborough borough which are held at the Wiltshire and Swindon History Centre.

These documents will be supported by a display illustrating life in Wiltshire in the 13th century and the impact of Magna Carta. Copies of documents will include images from the pageant in 1932 to celebrate the 800th anniversary of the founding of Lacock abbey.

The exhibition will be at Lacock Abbey in June and July and then at the Wiltshire and Swindon History Centre. The screens will then be available for display around the county.

A project to conserve and display 13th Century documents for the Salisbury Cathedral Magna Carta exhibition.

The Archive conservation team have recently been working on a project to conserve and display four 13th Century parchment documents for the 800th Anniversary of the Magna Carta exhibition at Salisbury Cathedral.

The documents are: a charter, an indulgence, a declaration of canonical obedience and an agreement of tithes.

Parian Ware - A Complex Jigsaw

on Tuesday, 06 January 2015. Posted in Conservation

We recently had a number of Parian ware figurines come in for treatment. Parian ware is a type of unglazed porcelain used in the 19th century to imitate marble. It was usually used to make figurines and other decorative pieces.  

The damage on the pieces ranged from a few minor chips to items that were in a fragmentary condition. It was clear that this would be a challenging treatment. Piecing together the broken items was especially difficult as fragments from many different figures were present in each box. It was not clear until we started work which object some of the fragments belonged with. Each piece would need to be positioned precisely to allow the fragments around it to fit correctly. Some joins had to be taken down and re assembled several times before the rest of the object could be put together satisfactorily.

Our Conservation team's expert handiwork is now on display at the Museum of East Asian Art

on Tuesday, 05 August 2014. Posted in Conservation

The Museum of East Asian Art in Bath currently has an exhibition showcasing some of their exquisite Chinese Metalwork and the conservation work carried out on the objects by conservators here at the Wiltshire and Swindon History Centre. The aim of the exhibition is to show that by carefully cleaning and looking after objects we can ensure they will be treasured for generations to come.

The objects on display are highly decorated often involving the use of, gold and silver or other coatings such as lacquer and enamelling. The presence of additional materials and decorative coatings makes the conservation of such objects more complex and so poses more of a challenge. Each of the treatments needs to be picked carefully to ensure the work carried out on one of the materials does not adversely affect any of the others.

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